2081678685 has 16 divisors (see below), whose sum is σ = 3365025216. Its totient is φ = 1098782208.

The previous prime is 2081678663. The next prime is 2081678699. The reversal of 2081678685 is 5868761802.

It is not a de Polignac number, because 2081678685 - 2⁵ = 2081678653 is a prime.

It is a super-2 number, since 2×2081678685² = 8666772295166658450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 713899 + ... + 716808.

It is an arithmetic number, because the mean of its divisors is an integer number (210314076).

Almost surely, 2^2081678685 is an apocalyptic number.

It is an amenable number.

2081678685 is a deficient number, since it is larger than the sum of its proper divisors (1283346531).

2081678685 is a wasteful number, since it uses less digits than its factorization.

2081678685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430812.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The square root of 2081678685 is about 45625.4170939839. The cubic root of 2081678685 is about 1276.8441717330.

The spelling of 2081678685 in words is "two billion, eighty-one million, six hundred seventy-eight thousand, six hundred eighty-five".